Modeling the strain localization around an underground gallery with a hydro-mechanical double scale model; effect of anisotropy |
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Institution: | 1. Irstea, Geomechanics Group, ETNA, Grenoble, France;2. Laboratoire Sols Solides Structures Risques, UJF-INPG-CNRS, Grenoble, France |
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Abstract: | This paper concerns the application of a finite element squared approach for modelling hydromechanical coupling in the simulation of gallery excavation in the context of radioactive waste repositories. The micromechanics of Callovo-Oxfordian claystone is modelled at the microscale, taking into account the interaction of different mechanical constituents and its interaction with pore fluid. In a framework of computational homogenization, the micromechanical behaviour is coupled to the macroscale boundary value problem of a poromechanical continuum with local second gradient paradigm. The simulations concern several cases of the “Transverse action” benchmark by Andra, in the context of which the model is used. |
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Keywords: | Double scale model Computational homogenization Strain localization Gallery excavation Hydromechanical coupling |
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